Attrition-mill.



No. 783,022. PATEN'IED FEB. 2l, 1905. L. D. COLLEY.

ATTRITION MILL.

APPLICATION FILED DBO. 26, 1902.

UNITED STATES Patented February 21, 1905.

PATENT OEEICE.

LEVI DAVID COLLEY, OF MUNOY, PENNSYLVANIA, ASSIGNOR TO SPROUT, IVALDRON AND COMPANY, OF MUNOY, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

ATTRlTlON-NIILL..

SPECIFICATION forming' part of Letters Patent No. 783,022, dated February 21, 1905.

Application filed December 26, 1902. Serial No. 136,670.

To {1J/Z whom t may concern.-

Be it known that I, LEVI DAVID OoLLEY, a'y citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania, have invented certain new and useful Improvements in Attrition-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to IO which it appertains to make and use the same.

This invention relates to attrition-mills of the vertical disk type in which the stock or material to be ground is fed through a central eye in one of the rotary grinding-plates or runner-heads.

The objects of the invention are to form a close or stock -tight joint between the feedspout or hopper and eye of the runner-head by means of intertting tubular sealing-rings, which are preferably removably secured one around the eye and the other around the feedopening, and to provide an improved construction and arrangement of such rings and hold the stationary ring in place by means of the feed-spout or hopper, which is secured to the casing over a flange of the ring fitting in a rabbet in the casing.

rl`hese objects are accomplished by means substantially as illustrated in the accompanying drawings, forming a part hereof, in which- Figure l is a central vertical cross-section of a mill of the character stated having my improvements embodied therein. Fig. 2 is an elevation of the runner through which the stock or material to be ground is fed, looking at the front or outer side thereof. Fig. 3 is a detail back view of one of the removable plates secured to the spokes of the runner- 40 head for conveying or pushing the stock inside the same. Fig. 4 is a transverse section of said plate. Fig. 5 is a side elevation of one of the outer stationary sealing-rings at the joint between. the feed-spout or hopper and the eye of the runner-head, and Fig. 6 is a rear elevation or View of the inner side thereof.

Referring to said drawings by specific letters of reference, A designates the base of an attrition-mill, upon which is mounted a casing B, which may consist of two confronting shells. Within said easing are a pair of runner-heads O and D, mounted on shafts E and F and having confronting grinding-surfaces or carrying cooperating grinding-plates. The

front runner-head D is carried by spokes G 55 on its shaft, said runner-head having a central eye or opening to receive the stock ormaterial to be ground, which is fed through said eye from a hopper or feed-spout H, bolted or secured to the outer side of the front shell of the casing. All the parts thus far described are of ordinary construction.

The joint between the feed-spout and eye of the runner-head is formed by`a pair of sealing-rings, one secured to and revolving with the runner-head, the other secured to the mill-casing or feed-spout, and one ring fitting closely within the other. These rings are indicated by the letters J and K in the drawings. As shown, the ring J has an an- 7o nular flange at its front end which fits in a rabbet therefor in the outer face of the shell or casing, and said ring is held in position by the feed-spout which is secured to said casing over said iiange. Ring K, which ts within the 7 5 first ring, is of similar construction, having a rear or inner fiange bolted or otherwise secu red to the front face of the runner-head. In some instances, however, the rings could be transposed, or ring J could rotate within ring K.

The rings are turned perfectly true, so that Aone revolves freely but closely within the other, thus furnishing a tight joint and preventing all leakage of the stock around the feed-spout and consequent presence of unground material in the iinished product. The interfitting tubular parts of the rings are also of substantial width, so that the runner-head can have a considerable endwise motion without danger of leakage of the material, while 90 the wide bearing-surfaces between the rings wear longer and render the construction more durable than where the runner-head is fitted against the shell or has a single ring with only the thickness of said shell to wear against. Furthermore, when worn the rings may readily be detached and replaced at trifling eX- pense, as the rings for every size of mill are designed to be made by templets and furnished quickly and cheaply. After the eX- change of the rings has been made the joint is as tight as before and as perfect in every respect as that of a new mill, so that the eX- pense of providing a new shell or runner-head is obviated.

To carry the stock uniformly through the eye of the runner-head, I preferably employ hardened-steel or other metal plates L, screwed or otherwise attached to the spokes of the runner-head, said plates having bevel side edges and having their narrower faces fitted against the spokes, so that said bevel edges push the material inward. These plates when worn -may be detached and ground sharp on their edges or may be replaced by new ones.

The intention of both improvements is to keep the capacity and efficiency of the mill normal throughout its entire life, to increase its durability, and to permit repairs to be made easily and without unnecessary expense. The parts are so arranged that the runnerhead, through which the stock is received, may be driven in either direction without affecting the capacity, the runner-head working equally well in both directions.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a'vertical-disk grinding-mill, the combination with a casing having a feed-opening and a runner-head having an eye through which the stock is received, of an inwardlyprojecting sealing-ring around said feed-opening having a flange at its outer end fitted in a rabbet therefor in the outer side ofthe casing, a feed-spout or hopper secured to said casing over said flange and thereby holding said ring in place, and a sealing-ring secured around the eye of the runner-head and rotatable therewith, one of said rings fitting within the other'.

2. In a vertical-disk grinding-mill, the combination with a casing having a feed-opening and a runner-head having an eye through which the stock is received, of an inwardlyprojecting sealing-ring around said feed-opening having a flange at its outer end fitted in a rabbet therefor in the outer side of the casing, a feed-spout or hopper secured to said casing over said fiange and thereby holding said ring in place, and a similar sealing-ring' having an end flange secured to said runnerhead around its eye, the latter ring rotatably fitting within the other.

3. In a grinding-mill, the combination with a casing having a feed-opening' and a runnerhead having an eye through which stock is received, of an inwardly-projecting sealingring around said feed-opening having a flange at its outer end fitted in a rabbet therefor in the outer side of the casing, a feed-spout or hopper secured to said casing over said flange and thereby holding said ring in place, and a cooperating sealing-ring secured around the eye of the runner-head, one of said rings rotatably fitting within the other, and both rings being removable.

In testimony whereof I affix my signature in presence of two witnesses.

LEVI DAVID COLLEY.

I/Vitn esses:

STEPHEN SoARs, C. C. PFLnnos. 

